Portable derrick.



T. G. SGHMBISBR.

PORTABLE DEB-RICK. uPLlonIon FILED msn 2s, 1911.

1,012,921 Patented M126, 1911.

coLulmA PLnNouuAPH co.. wAsmNn'rnN, o, c.

THEODORE G. SCHMEISER, 0F DAVIS, CALIFORNIA.

PORTABLE DERRICK.

Specification of Letters Patent.

Patented Dec. 26, 1911.

Application led June 28, 1911. Serial No. 635,838.

To all whom it may concern.'

Be it known that I, THEoDoRE G. Soni/misma, a citizen of the UnitedStates, residing at Davis, in the county of Yolo and State ofCalifornia, have invented new and. useful Improvements in PortableDerricks, of which the following is a specification.

This invention relates to im rovements in portable cranes or derricks wich are especiall designed for use in loading or stacking ay.

It is the object of this invention to provide a derrick which is adaptedto be moved readily from place to place, and over ordinary roads oracross fields, and which is so constructed as to admit of the boom beingtilted Iso that the derrick may be readily passed beneath high powerelectric wires, or other` over-head obstructions without dan ger, andWithout otherwise having to cut the wires or dismantle the derrick.

A further object is to provide a simple and efficient method formounting the boom, and for retaining it in its uppermost normal rigidposition when in operation.

The invention consists of the parts and the combination and constructionof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, 1n whichz Figure 1 is aperspective view of the invention. Fig. 2 is an end view of thetriangular boom. Fig. 3 is a side yiew of s ame as disposed in ahorizontal pos1t1on. Fig. 4 is a plan view of same. Fi 5 is an enlargedsection on the line X X, o Fig. 1. Fig. 6 1s an enlarged section on theline Y Y, of Fig. 3.

In the drawings A represents an A-frame supported at its rear end on anaxle 2 and at its forward end or apex ortion on the reach 3. The rearend of e reach is attached to the upper side of the axle, and theA-frame at its forward end is so supported above the reach that theframe will be substantially horizontal when the apparatus has been lacedon wheels. The axle 2 is of such len that the hind wheels are separatedsu ciently so as to oHer a solid foundation for the apparatus when aload is being lifted and transported by the derrick. The forward end ofthe reach is adapted to be attached to the front axle 2 of an ordinaryfarm-wagon. The hind wheel of the same wagon may be used in connectionwith the axle 2 so that no especial running gear further than thatdescribed, is necessary.

A pillar or mast 4 is stepped on the reach at 5 and is supported in avertical position by means of the convergent trapezoidal frames 6-6. Thebase of each of these frames 6 6 rests transversely upon the A-frame andat their top are secured to a jclrnal block 7 in which the mast 4 isturna e.

8 is a boom which is pivoted at 9 to the mast 4 to swing in a verticalplane.

The mast carries sheaves 10-11 at either end through which a fall-rope12 passes. Any suitable gripping and conveying means, as a derrick fork,may be carried at the outer end of the rope 12.

The essence of the present invention lies in the method of mounting theboom on the mast to admit of the boom being tilted in a verticaldirection so that it may be lowered when it is necessary to pass beneathoverhead wires or other obstructions, and also in the mannr ofautomatically locking the boom in its uppermost position.

The boom consists substantially of a pair arallel triangular framesconnected toget er at their ends and sprung apart at the point ofjuncture with the mast, and disposed astride of the latter as shown inFig. 4. Mounted on the upper end of the mast are cheek-plates 18 againstwhich other cheeklates 14 on the inner faces of the boom rames are inslidable contact. Mounted on the boom frames are bearing blocks 15 forthe pivot pin 9, which is mounted on the mast and extends through thecheek-plates 13, as shown in Fig. 6. The cheek-plates 13 and 14 form asubstantial lateral bearing between the pivoted boom and the mast.

Mounted on the inner faces of the lower angular springy extensions orbraces 16 of the boom frame, and at a suitable distance from the anglethereof, is a pair of oppositely disposed wedge-shaped locking lugs 17which are adapted when the braces 16 are sprung apart .to allow thelonger end of the boom to drop as shown in dotted lines Fig. 1; or whenthe short end of the boom is pulled down to slide over the sides of themast and become engaged at the front thereof, as shown in Fig. 5, andhold the boom in its uppermost operative position, as indicated in fulllines in Fig. 1.

Cheek-plates 18 are provided on the sides of the mast at the point ofengagement with the boom braces 16; similar cheek-plates 19 beingprovided on the inner faces of the braces, as shown in Fig. 5.

The braces are springy and are adapted to be spread so as to tend tothrow the lugs 17 out offengagement with the mast, by means of a spring21 which surrounds a bolt 22 which passes4 through the b races on theside of the mast opposite the lugs 17 (Fig. 5). The `spreading of thebraces is limited by the heads on bolt 22.

In order to securely clamp the braces against the mast so as to preventthe locking. lugs 17 being inadvertently disengaged therefrom, I haveshown a hin ed clamp ar 23 pivotally mounted on one race member at 24,and adapted to extend under and alongside of the other member againstthe frame, as shown in Fig. 5 and carrying a .Wing bolt- 25 adapted tobe screwed against the loutside of the adjacent brace member in suchmanner as to draw the two members toward each other and clamp themagainst the sides of the mast.

In o eration the boom stands in the elevated fgiill line position, asshown in Fig. 1 when the device is used as a derrick. The boom beingsecurely braced and held rigidly in position on its mast by theengagement of the locking lugs 17 in front of the mast; the clamping bar23 securely holding the parts in locked rigid position. In the event thederrick is to be moved from one position or field to another or alongcountry roads and is required ,to pass under telegraph, telephone orhigh tension power wires, all the operator has to do is to loosen theclamp screw 25 allowing the bar 23 to drop down, whereu on the spring 21will spread the braces of t e boom, allowing the front end of the boomto fall and assume the dotted line position of Fig. 1; the downwardmovement of the boom being controlled by the fall-line 12. With the boomthus in a lowered position the point of the longer arm of the boom willengage beneath any low hangin wire, which latter is indicated at 26, anthe wire will be crowded up as the vehicle travels along and finally Ydropped behind the apparatus without causing any trouble.

Having thus described my invention, what I claim and desire to secure byLetters Patent is 1. In a portable derrick having a mast, a triangularboom pivoted intermediate its ends on the mast to swing in a verticalplane, said boom divided longitudinally and disposed astride the mast,and means for temporarily locking the boom against movement in relationto the mast, said means consisting of a pair of wedge-shaped lockinglugsmounted on said boom and adapted to engage the mast.

2. In a portable derrick having a mast, a triangular boom pvotedintermediate its ends on the mast to swing in a vertical plane, saidboom divided longitudinally and disposed astride the mast, and means fortemporarily locking the boom against movement in relation to the mast,said means consisting of a pair of wedge-shaped locking-lugs mounted onsaid boom and adapted to engage the mast, and a clamp for retainin saidlocking-lugs in engagement with t e mast.

3. In a portable derrick having a revoluble mast, a boom composed of apair of triangular frames sprun apart and disposed astride the mast anpivotally mounted thereon; means for temporarily locking the boomagainst movement in relation to the mast, and means for releasing thelocking means to permit the boom to rock vertically on its pivotalbearing.

4. In a portable derrick having a revoluble mast, a boom composed of apair of triangular frames sprun apart and disposed astride the mast anpivotally mounted thereon; and means for temporarily locking the boomagainst movement in relation to the mastpsaid means including a pair ofwedge-shaped locking-lugs and a clamp for retaining said locking-lugs inengagement with the mast. Y

5. In a portable derrick having a revoluble mast, a boom composed of apair of triangular frames sprun astride the mast an pvotally mountedthereon; means for temporarily locking 4the boom against movement inrelation to the mast, said means including a pair of wedgeshapedlocking-lu s and a clamp for retain- `ing said lockingugs in engagementwith the mast, and means for releasin the locking-lugs from engagementwith t e mast to permit the boom to rock vertically on its pivotalbearing.

6. In a portable derrick having a revoluble mast, a boom composed of apair of triangular frames sprung apart and disposed apart and disposedastride the mast and pivotally mounted thereon; means for temporarilylocking the boom against movement in relation to the mast, said meansincluding a pair of Wedgeshaped locking-lugs and a clamp forretainhelical spring disposed between the triangu lar frames to normallyspread them apart at a point near the lookin -lugs.

In testimony Whereoil have hereunto set my hand in the presence of twosubscribing 15 Witnesses.

THEODORE G. SCHMEISER.

Witnesses:

L. M. ROGERS, W. R. MATTHEW.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, ZD. C.

